CEDAR: The Mesosphere and Lower Thermosphere Using the USU/CASS Atmospheric Lidar Observatory

CEDAR：使用 USU/CASS 大气激光雷达观测站的中层和低层热层

• 批准号: 9714789
• 负责人: Vincent Wickwar
• 金额: $ 18万
• 依托单位: Utah State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-02-01 至 2002-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9714789&HistoricalAwards=false
• 关键词: CEDAR; Mesosphere; Lower; Thermosphere; Using

Researchers use the Atmospheric Lidar Observatory to couple lower portion of the atmosphere with the upper mesosphere and lower thermosphere. Based on lidar observations of mid-stratosphere to lower thermosphere temperatures, this emphasizes the transition region between the upper mesosphere and lower thermosphere. Using a much larger telescope, they're able to precisely determine Rayleigh-scatter temperatures and time resolution in the upper mesosphere, and extend maximum altitude above 100 kilometers. Nightly averaged lidar temperatures are used to study seasonal variations in the transition region, especially (1) the mesopause altitude and structure near 87 and 102 kilometers, (2) the relationship between high-altitude summer inversion layers (by Rayleigh lidar) and an inversion layer near 90 kilometers (by sodium lidar), (3) the behavior of vertical wave-like appearance of mesospheric inversion layers to higher altitudes. These nightly temporal variations (or their monthly averages) examine time-varying phenomena, such as tides and downward/upward phase progression of mesospheric inversion layers.

研究人员使用大气激光雷达观测站将大气层的下部与上部中间层和下部热层耦合。 根据激光雷达对平流层中层至低热层温度的观测结果，这一研究强调了中层上层与低热层之间的过渡区域。 使用更大的望远镜，他们能够精确地确定中间层上部的瑞利散射温度和时间分辨率，并将最大高度扩展到100公里以上。 利用夜间平均激光雷达温度研究了过渡区的季节变化，特别是（1）87和102公里附近的中层顶高度和结构，（2）夏季高空逆温层与大气环流的关系（由瑞利激光雷达）和90公里附近的逆温层（3）中层逆温层向高空的垂直波动现象。 这些夜间的时间变化（或其月平均值）检查随时间变化的现象，如潮汐和中层逆温层的向下/向上相位进展。